Optical imaging lens and electronic device comprising the same

ABSTRACT

An optical imaging lens set includes a first lens element with an object-side surface of a convex part in a vicinity of the optical axis, a second lens element with an image-side surface of a concave part in a vicinity of its periphery, the first lens element being glued to the second lens element to eliminate an air gap, a third lens element with an object-side surface of a concave part in a vicinity of its periphery, a fourth lens element and a fifth lens element of plastic material, ALT being the total thickness of the five lens elements and Gmax being the max value of the air gap from the first lens element to the fifth lens element so that ALT/Gmax≤2.2.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation of the application, Ser. No.15/162,626, filed on May 24, 2016, which claims priority to ChinesePatent Application No. 201610179030.2, filed on Mar. 25, 2016. Thecontents thereof are included herein by reference.

BACKGROUND OF THE INVENTION 1. Field of the Invention

The present invention generally relates to an optical imaging lens setand an electronic device which includes such optical imaging lens set.Specifically speaking, the present invention is directed to an opticalimaging lens set of reduced length and an electronic device whichincludes such optical imaging lens set.

2. Description of the Prior Art

The specification of consumer electronics changes all the time to pursuesmaller and smaller sizes. The current trend of research is to developan optical imaging lens set of a shorter length with uncompromised goodquality to meet the demand. The most important characters of an opticalimaging lens set are image quality and size.

As far as an optical imaging lens set of five lens elements isconcerned, the prior art proposes a longer distance from the object-sidesurface of the first lens element to the image plane, which does notfavor the size reduction of mobile phones or of cameras. On the otherhand, the image quality tends to deteriorate for capturing images of anobject far away so it is still a problem to reduce the system lengthefficiently and to maintain sufficient optical performance in thisfield. This is an important objective to research.

SUMMARY OF THE INVENTION

In the light of the above, the present invention proposes an opticalimaging lens set of lightweight, low production cost, reduced length,high resolution and high image quality. The optical imaging lens set offive lens elements of the present invention includes an aperture stop, afirst lens element, a second lens element, a third lens element, afourth lens element and a fifth lens element sequentially from an objectside to an image side along an optical axis. Each lens element has anobject-side surface facing toward the object side as well as animage-side surface facing toward the image side.

The first lens element has an object-side surface with a convex portionin a vicinity of the optical axis. The second lens element has animage-side surface with a concave portion in a vicinity of its peripheryand is glued to the first lens element without an air gap. The thirdlens element has an object-side surface with a concave portion in avicinity of its periphery. The fourth lens element and the fifth lenselement are made of a plastic material. The optical imaging lens setexclusively has five lens elements with refractive power. ALT is thetotal thickness of the five lens elements and G_(max) is the max valueof the air gaps from the first lens element to the fifth lens element sothat ALT/G_(max)≤2.2.

In the optical imaging lens set of five lens elements of the presentinvention, an air gap G₂₃ between the second lens element and the thirdlens element along the optical axis, an air gap G₄₅ between the fourthlens element and the fifth lens element along the optical axis and thefourth lens element has a fourth lens element thickness T₄ to satisfy(G₂₃+G₄₅)/T₄≥2.5.

In the optical imaging lens set of five lens elements of the presentinvention, an air gap G₃₄ between the third lens element and the fourthlens element and the sum of all air gaps AAG between each lens elementsfrom the first lens element to the fifth lens element along the opticalaxis satisfy AAG/G₃₄≤60.0.

In the optical imaging lens set of five lens elements of the presentinvention, the second lens element has a second lens element thicknessT₂ to satisfy (G₂₃+G₃₄)/T₂≥3.5.

In the optical imaging lens set of five lens elements of the presentinvention, the fifth lens element has a fifth lens element thickness T₅to satisfy ALT/T₅<5.4.

In the optical imaging lens set of five lens elements of the presentinvention, the first lens element has a first lens element thicknessT_(l) to satisfy T₁/G₃₄≤10.0.

The optical imaging lens set of five lens elements of the presentinvention satisfies G₂₃/(T₂+T₅)≥1.0.

In the optical imaging lens set of five lens elements of the presentinvention, the third lens element has a third lens element thickness T₃to satisfy AAG/(T₃+T₅)≥1.8.

The optical imaging lens set of five lens elements of the presentinvention satisfies ALT/(T₃+T₄)≥2.9.

The optical imaging lens set of five lens elements of the presentinvention satisfies (T₄+T₅)/G₃₄≤30.0.

In the optical imaging lens set of five lens elements of the presentinvention, EFL is the effective focal length of the optical imaging lensset satisfies EFL/(G₂₃+G₃₄)≤5.5.

The optical imaging lens set of five lens elements of the presentinvention satisfies G₂₃/T₃≥2.5.

The optical imaging lens set of five lens elements of the presentinvention satisfies (G₃₄+G₄₅)/T₂≥0.8.

The optical imaging lens set of five lens elements of the presentinvention satisfies ALT/T₁≤4.0.

The optical imaging lens set of five lens elements of the presentinvention satisfies EFL/(T₁+T₂)≤6.7.

The present invention also proposes an electronic device which includesthe optical imaging lens set as described above. The electronic deviceincludes a case and an image module disposed in the case. The imagemodule includes an optical imaging lens set as described above, a barrelfor the installation of the optical imaging lens set, a module housingunit for the installation of the barrel and an image sensor disposed atan image side of the optical imaging lens set.

These and other objectives of the present invention will no doubt becomeobvious to those of ordinary skill in the art after reading thefollowing detailed description of the preferred embodiment that isillustrated in the various figures and drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1-5 illustrates the methods for determining the surface shapes andfor determining one region is a region in a vicinity of the optical axisor the region in a vicinity of its circular periphery of one lenselement.

FIG. 6 illustrates a first example of the optical imaging lens set ofthe present invention.

FIG. 7A illustrates the longitudinal spherical aberration on the imageplane of the first example.

FIG. 7B illustrates the astigmatic aberration on the sagittal directionof the first example.

FIG. 7C illustrates the astigmatic aberration on the tangentialdirection of the first example.

FIG. 7D illustrates the distortion aberration of the first example.

FIG. 8 illustrates a second example of the optical imaging lens set offive lens elements of the present invention.

FIG. 9A illustrates the longitudinal spherical aberration on the imageplane of the second example.

FIG. 9B illustrates the astigmatic aberration on the sagittal directionof the second example.

FIG. 9C illustrates the astigmatic aberration on the tangentialdirection of the second example.

FIG. 9D illustrates the distortion aberration of the second example.

FIG. 10 illustrates a third example of the optical imaging lens set offive lens elements of the present invention.

FIG. 11A illustrates the longitudinal spherical aberration on the imageplane of the third example.

FIG. 11B illustrates the astigmatic aberration on the sagittal directionof the third example.

FIG. 11C illustrates the astigmatic aberration on the tangentialdirection of the third example.

FIG. 11D illustrates the distortion aberration of the third example.

FIG. 12 illustrates a fourth example of the optical imaging lens set offive lens elements of the present invention.

FIG. 13A illustrates the longitudinal spherical aberration on the imageplane of the fourth example.

FIG. 13B illustrates the astigmatic aberration on the sagittal directionof the fourth example.

FIG. 13C illustrates the astigmatic aberration on the tangentialdirection of the fourth example.

FIG. 13D illustrates the distortion aberration of the fourth example.

FIG. 14 illustrates a fifth example of the optical imaging lens set offive lens elements of the present invention.

FIG. 15A illustrates the longitudinal spherical aberration on the imageplane of the fifth example.

FIG. 15B illustrates the astigmatic aberration on the sagittal directionof the fifth example.

FIG. 15C illustrates the astigmatic aberration on the tangentialdirection of the fifth example.

FIG. 15D illustrates the distortion aberration of the fifth example.

FIG. 16 illustrates a sixth example of the optical imaging lens set offive lens elements of the present invention.

FIG. 17A illustrates the longitudinal spherical aberration on the imageplane of the sixth example.

FIG. 17B illustrates the astigmatic aberration on the sagittal directionof the sixth example.

FIG. 17C illustrates the astigmatic aberration on the tangentialdirection of the sixth example.

FIG. 17D illustrates the distortion aberration of the sixth example.

FIG. 18 illustrates a seventh example of the optical imaging lens set offive lens elements of the present invention.

FIG. 19A illustrates the longitudinal spherical aberration on the imageplane of the seventh example.

FIG. 19B illustrates the astigmatic aberration on the sagittal directionof the seventh example.

FIG. 19C illustrates the astigmatic aberration on the tangentialdirection of the seventh example.

FIG. 19D illustrates the distortion aberration of the seventh example.

FIG. 20 illustrates an eighth example of the optical imaging lens set offive lens elements of the present invention.

FIG. 21A illustrates the longitudinal spherical aberration on the imageplane of the eighth example.

FIG. 21B illustrates the astigmatic aberration on the sagittal directionof the eighth example.

FIG. 21C illustrates the astigmatic aberration on the tangentialdirection of the eighth example.

FIG. 21D illustrates the distortion aberration of the eighth example.

FIG. 22 illustrates a ninth example of the optical imaging lens set offive lens elements of the present invention.

FIG. 23A illustrates the longitudinal spherical aberration on the imageplane of the ninth example.

FIG. 23B illustrates the astigmatic aberration on the sagittal directionof the ninth example.

FIG. 23C illustrates the astigmatic aberration on the tangentialdirection of the ninth example.

FIG. 23D illustrates the distortion aberration of the ninth example.

FIG. 24 illustrates a tenth example of the optical imaging lens set offive lens elements of the present invention.

FIG. 25A illustrates the longitudinal spherical aberration on the imageplane of the tenth example.

FIG. 25B illustrates the astigmatic aberration on the sagittal directionof the tenth example.

FIG. 25C illustrates the astigmatic aberration on the tangentialdirection of the tenth example.

FIG. 25D illustrates the distortion aberration of the tenth example.

FIG. 26 illustrates an eleventh example of the optical imaging lens setof five lens elements of the present invention.

FIG. 27A illustrates the longitudinal spherical aberration on the imageplane of the eleventh example.

FIG. 27B illustrates the astigmatic aberration on the sagittal directionof the eleventh example.

FIG. 27C illustrates the astigmatic aberration on the tangentialdirection of the eleventh example.

FIG. 27D illustrates the distortion aberration of the eleventh example.

FIG. 28 illustrates a first preferred example of the portable electronicdevice with an optical imaging lens set of the present invention.

FIG. 29 illustrates a second preferred example of the portableelectronic device with an optical imaging lens set of the presentinvention.

FIG. 30 shows the optical data of the first example of the opticalimaging lens set.

FIG. 31 shows the aspheric surface data of the first example.

FIG. 32 shows the optical data of the second example of the opticalimaging lens set.

FIG. 33 shows the aspheric surface data of the second example.

FIG. 34 shows the optical data of the third example of the opticalimaging lens set.

FIG. 35 shows the aspheric surface data of the third example.

FIG. 36 shows the optical data of the fourth example of the opticalimaging lens set.

FIG. 37 shows the aspheric surface data of the fourth example.

FIG. 38 shows the optical data of the fifth example of the opticalimaging lens set.

FIG. 39 shows the aspheric surface data of the fifth example.

FIG. 40 shows the optical data of the sixth example of the opticalimaging lens set.

FIG. 41 shows the aspheric surface data of the sixth example.

FIG. 42 shows the optical data of the seventh example of the opticalimaging lens set.

FIG. 43 shows the aspheric surface data of the seventh example.

FIG. 44 shows the optical data of the eighth example of the opticalimaging lens set.

FIG. 45 shows the aspheric surface data of the eighth example.

FIG. 46 shows the optical data of the ninth example of the opticalimaging lens set.

FIG. 47 shows the aspheric surface data of the ninth example.

FIG. 48 shows the optical data of the tenth example of the opticalimaging lens set.

FIG. 49 shows the aspheric surface data of the tenth example.

FIG. 50 shows the optical data of the eleventh example of the opticalimaging lens set.

FIG. 51 shows the aspheric surface data of the eleventh example.

FIG. 52 shows some important ratios in the examples.

DETAILED DESCRIPTION

Before the detailed description of the present invention, the firstthing to be noticed is that in the present invention, similar (notnecessarily identical) elements are labeled as the same numeralreferences. In the entire present specification, “a certain lens elementhas negative/positive refractive power” refers to the part in a vicinityof the optical axis of the lens element has negative/positive refractivepower calculated by Gaussian optical theory. An object-side/image-sidesurface refers to the region which allows imaging light passing through,in the drawing, imaging light includes Lc (chief ray) and Lm (marginalray). As shown in FIG. 1, the optical axis is “I” and the lens elementis symmetrical with respect to the optical axis I. The region A thatnear the optical axis and for light to pass through is the region in avicinity of the optical axis, and the region C that the marginal raypassing through is the region in a vicinity of a certain lens element'scircular periphery. In addition, the lens element may include anextension part E for the lens element to be installed in an opticalimaging lens set (that is the region outside the region C perpendicularto the optical axis). Ideally speaking, no light would pass through theextension part, and the actual structure and shape of the extension partis not limited to this and may have other variations. For the reason ofsimplicity, the extension part is not illustrated in the followingexamples. More, precisely, the method for determining the surface shapesor the region in a vicinity of the optical axis, the region in avicinity of its circular periphery and other regions is described in thefollowing paragraphs:

1. FIG. 1 is a radial cross-sectional view of a lens element. Beforedetermining boundaries of those aforesaid portions, two referentialpoints should be defined first, middle point and conversion point. Themiddle point of a surface of a lens element is a point of intersectionof that surface and the optical axis. The conversion point is a point ona surface of a lens element, where the tangent line of that point isperpendicular to the optical axis. Additionally, if multiple conversionpoints appear on one single surface, then these conversion points aresequentially named along the radial direction of the surface withnumbers starting from the first conversion point. For instance, thefirst conversion point (closest one to the optical axis), the secondconversion point, and the N^(th) conversion point (farthest one to theoptical axis within the scope of the clear aperture of the surface). Theportion of a surface of the lens element between the middle point andthe first conversion point is defined as the portion in a vicinity ofthe optical axis. The portion located radially outside of the N^(th)conversion point (but still within the scope of the clear aperture) isdefined as the portion in a vicinity of a periphery of the lens element.In some embodiments, there are other portions existing between theportion in a vicinity of the optical axis and the portion in a vicinityof a periphery of the lens element; the numbers of portions depend onthe numbers of the conversion point(s). In addition, the radius of theclear aperture (or a so-called effective radius) of a surface is definedas the radial distance from the optical axis I to a point ofintersection of the marginal ray Lm and the surface of the lens element.2. Referring to FIG. 2, determining the shape of a portion is convex orconcave depends on whether a collimated ray passing through that portionconverges or diverges. That is, while applying a collimated ray to aportion to be determined in terms of shape, the collimated ray passingthrough that portion will be bended and the ray itself or its extensionline will eventually meet the optical axis. The shape of that portioncan be determined by whether the ray or its extension line meets(intersects) the optical axis (focal point) at the object-side orimage-side. For instance, if the ray itself intersects the optical axisat the image side of the lens element after passing through a portion,i.e. the focal point of this ray is at the image side (see point R inFIG. 2), the portion will be determined as having a convex shape. On thecontrary, if the ray diverges after passing through a portion, theextension line of the ray intersects the optical axis at the object sideof the lens element, i.e. the focal point of the ray is at the objectside (see point M in FIG. 2), that portion will be determined as havinga concave shape. Therefore, referring to FIG. 2, the portion between themiddle point and the first conversion point has a convex shape, theportion located radially outside of the first conversion point has aconcave shape, and the first conversion point is the point where theportion having a convex shape changes to the portion having a concaveshape, namely the border of two adjacent portions. Alternatively, thereis another common way for a person with ordinary skill in the art totell whether a portion in a vicinity of the optical axis has a convex orconcave shape by referring to the sign of an “R” value, which is the(paraxial) radius of curvature of a lens surface. The R value iscommonly used in conventional optical design software such as Zemax andCodeV. The R value usually appears in the lens data sheet in thesoftware. For an object-side surface, positive R means that theobject-side surface is convex, and negative R means that the object-sidesurface is concave. Conversely, for an image-side surface, positive Rmeans that the image-side surface is concave, and negative R means thatthe image-side surface is convex. The result found by using this methodshould be consistent as by using the other way mentioned above, whichdetermines surface shapes by referring to whether the focal point of acollimated ray is at the object side or the image side.3. For none conversion point cases, the portion in a vicinity of theoptical axis is defined as the portion between 0-50% of the effectiveradius (radius of the clear aperture) of the surface, whereas theportion in a vicinity of a periphery of the lens element is defined asthe portion between 50˜100% of effective radius (radius of the clearaperture) of the surface.

Referring to the first example depicted in FIG. 3, only one conversionpoint, namely a first conversion point, appears within the clearaperture of the image-side surface of the lens element. Portion I is aportion in a vicinity of the optical axis, and portion II is a portionin a vicinity of a periphery of the lens element. The portion in avicinity of the optical axis is determined as having a concave surfacedue to the R value at the image-side surface of the lens element ispositive. The shape of the portion in a vicinity of a periphery of thelens element is different from that of the radially inner adjacentportion, i.e. the shape of the portion in a vicinity of a periphery ofthe lens element is different from the shape of the portion in avicinity of the optical axis; the portion in a vicinity of a peripheryof the lens element has a convex shape.

Referring to the second example depicted in FIG. 4, a first conversionpoint and a second conversion point exist on the object-side surface(within the clear aperture) of a lens element. In which portion I is theportion in a vicinity of the optical axis, and portion III is theportion in a vicinity of a periphery of the lens element. The portion ina vicinity of the optical axis has a convex shape because the R value atthe object-side surface of the lens element is positive. The portion ina vicinity of a periphery of the lens element (portion III) has a convexshape. What is more, there is another portion having a concave shapeexisting between the first and second conversion point (portion II).

Referring to a third example depicted in FIG. 5, no conversion pointexists on the object-side surface of the lens element. In this case, theportion between 0˜50% of the effective radius (radius of the clearaperture) is determined as the portion in a vicinity of the opticalaxis, and the portion between 50˜100% of the effective radius isdetermined as the portion in a vicinity of a periphery of the lenselement. The portion in a vicinity of the optical axis of theobject-side surface of the lens element is determined as having a convexshape due to its positive R value, and the portion in a vicinity of aperiphery of the lens element is determined as having a convex shape aswell.

As shown in FIG. 6, the optical imaging lens set 1 of five lens elementsof the present invention, sequentially from an object side 2 (where anobject is located) to an image side 3 along an optical axis 4, has anaperture stop 80, a first lens element 10, a second lens element 20, athird lens element 30, a fourth lens element 40, a fifth lens element50, a filter 70 and an image plane 71. Generally speaking, the firstlens element 10, the second lens element 20 and the third lens element30 maybe made of a transparent plastic material, but the presentinvention is not limited to this. The fourth lens element 40 and thefifth lens element 50 are made of a transparent plastic material. Thereare exclusively the first lens element 10, the second lens element 20,the third lens element 30, the fourth lens element 40 and the fifth lenselement 50 with refractive power in the optical imaging lens set 1 ofthe present invention. The optical axis 4 is the optical axis of theentire optical imaging lens set 1, and the optical axis of each of thelens elements coincides with the optical axis of the optical imaginglens set 1.

Furthermore, the optical imaging lens set 1 includes an aperture stop(ape. stop) 80 disposed in an appropriate position. In FIG. 6, theaperture stop 80 is disposed between the object side 2 and the firstlens element 10. When light emitted or reflected by an object (notshown) which is located at the object side 2 enters the optical imaginglens set 1 of the present invention, it forms a clear and sharp image onthe image plane 71 at the image side 3 after passing through theaperture stop 80, the first lens element 10, the second lens element 20,the third lens element 30, the fourth lens element 40, the fifth lenselement 50 and the filter 70. In the embodiments of the presentinvention, the optional filter 70 may be a filter of various suitablefunctions, for example, the filter 70 may be an infrared cut filter (IRcut filter), placed between the image-side surface 52 of the fifth lenselement 50 and the image plane 71.

Each lens element in the optical imaging lens set 1 of the presentinvention has an object-side surface facing toward the object side aswell as an image-side surface facing toward the image side 3. Inaddition, each object-side surface and image-side surface in the opticalimaging lens set 1 of the present invention has a part in a vicinity ofits circular periphery (circular periphery part) away from the opticalaxis 4 as well as a part in a vicinity of the optical axis (optical axispart) closer to the optical axis 4. For example, the first lens element10 has an object-side surface 11 and an image-side surface 12; thesecond lens element 20 has an object-side surface 21 and an image-sidesurface 22; the third lens element 30 has an object-side surface 31 andan image-side surface 32; the fourth lens element 40 has an object-sidesurface 41 and an image-side surface 42; the fifth lens element 50 hasan object-side surface 51 and an image-side surface 52.

Each lens element in the optical imaging lens set 1 of the presentinvention further has a central thickness T on the optical axis 4. Forexample, the first lens element 10 has a first lens element thicknessT₁, the second lens element 20 has a second lens element thickness T₂,the third lens element 30 has a third lens element thickness T₃, thefourth lens element 40 has a fourth lens element thickness T₄, and thefifth lens element 50 has a fifth lens element thickness T₅. Therefore,the total thickness of all the lens elements in the optical imaging lensset 1 along the optical axis 4 is ALT=T₁+T₂+T₃+T₄+T₅.

In addition, between two adjacent lens elements in the optical imaginglens set 1 of the present invention there may be an air gap G along theoptical axis 4. For example, an air gap G₂₃ is disposed between thesecond lens element 20 and the third lens element 30, an air gap G₃₄ isdisposed between the third lens element 30 and the fourth lens element40, an air gap G₄₅ is disposed between the fourth lens element 40 andthe fifth lens element 50 but the air gap G₁₂ is zero because the firstlens element 10 is glued to the second lens element 20. Therefore, thesum of total three air gaps between adjacent lens elements from thesecond lens element 10 to the fifth lens element 50 along the opticalaxis 4 is AAG=G₂₃+G₃₄+G₄₅.

In addition, the distance between the first object-side surface 11 ofthe first lens element 10 to the image plane 71, namely the total lengthof the optical imaging lens set along the optical axis 4 is TTL; G_(max)is the max value of the air gaps from the first lens element 10 to thefifth lens element 50 along the optical axis 4; the effective focallength of the optical imaging lens set is EFL.

Furthermore, the focal length of the first lens element 10 is f1; thefocal length of the second lens element 20 is f2; the focal length ofthe third lens element 30 is f3; the focal length of the fourth lenselement 40 is f4; the focal length of the fifth lens element 50 is f5;the refractive index of the first lens element 10 is n1; the refractiveindex of the second lens element 20 is n2; the refractive index of thethird lens element 30 is n3; the refractive index of the fourth lenselement 40 is n4; the refractive index of the fifth lens element 50 isn5; the Abbe number of the first lens element 10 is v1; the Abbe numberof the second lens element 20 is v2; the Abbe number of the third lenselement 30 is v3; and the Abbe number of the fourth lens element 40 isv4; the Abbe number of the fifth lens element 50 is v5.

First Example

Please refer to FIG. 6 which illustrates the first example of theoptical imaging lens set 1 of the present invention. Please refer toFIG. 7A for the longitudinal spherical aberration on the image plane 71of the first example; please refer to FIG. 7B for the astigmatic fieldaberration on the sagittal direction; please refer to FIG. 7C for theastigmatic field aberration on the tangential direction, and pleaserefer to FIG. 7D for the distortion aberration. The Y axis of thespherical aberration in each example is “field of view” for 1.0. The Yaxis of the astigmatic field and the distortion in each example standsfor “image height”, which is 2.52 mm. The length from the object-sidesurface 11 of the first lens element 10 to the image plane 71 along theoptical axis 4 is 6.142 mm.

The optical imaging lens set 1 of the first example has five lenselements 10, 20, 30, 40 and 50 with refractive power. The opticalimaging lens set 1 also has a filter 70, an aperture stop 80, and animage plane 71. The aperture stop 80 is provided between the object side2 and the first lens element 10. The filter 70 may be an infrared filter(IR cut filter) to prevent inevitable infrared in light reaching theimage plane to adversely affect the imaging quality.

The first lens element 10 has positive refractive power. The firstobject-side surface 11 facing toward the object side 2 has a convex part13 in the vicinity of the optical axis and a convex part 14 in avicinity of its circular periphery. The first image-side surface 12facing toward the image side 3 has a concave part 16 in the vicinity ofthe optical axis and a concave part 17 in a vicinity of its circularperiphery. Besides, the first object-side surface 11 of the first lenselement 10 is aspherical and the first image-side 12 of the first lenselement 10 is spherical.

The second lens element 20 has negative refractive power. The secondobject-side concave surface 21 facing toward the object side 2 has aconvex part 23 in the vicinity of the optical axis and a convex part 24in a vicinity of its circular periphery. The second image-side surface22 facing toward the image side 3 has a concave part 26 in the vicinityof the optical axis and a concave part 27 in a vicinity of its circularperiphery. The second object-side surface 21 of the second lens element20 is spherical and the second image-side 22 of the second lens element20 is aspherical. In particular, the first lens element 10 is glued tothe second lens element 20 without an air gap.

The third lens element 30 has negative refractive power. The thirdobject-side surface 31 facing toward the object side 2 has a convex part33 in the vicinity of the optical axis and a concave part 34 in avicinity of its circular periphery. The third image-side surface 32facing toward the image side 3 has a concave part 36 in the vicinity ofthe optical axis and a concave part 37 in a vicinity of its circularperiphery. Both the third object-side surface 31 and the thirdimage-side 32 of the third lens element 30 are aspherical.

The fourth lens element 40 has negative refractive power. The fourthobject-side surface 41 facing toward the object side 2 has a convex part43 in the vicinity of the optical axis and a concave part 44 in avicinity of its circular periphery. The fourth image-side surface 42facing toward the image side 3 has a concave part 46 in the vicinity ofthe optical axis and a convex part 47 in a vicinity of its circularperiphery. Both the fourth object-side surface 41 and the fourthimage-side 42 of the fourth lens element 40 are aspherical.

The fifth lens element 50 has positive refractive power. The fifthobject-side surface 51 facing toward the object side 2 has a convex part53 in the vicinity of the optical axis and a concave part 54 in avicinity of its circular periphery. The fifth image-side surface 52facing toward the image side 3 has a concave part 56 in the vicinity ofthe optical axis and a convex part 57 in a vicinity of its circularperiphery. Both the fifth object-side surface 51 and the fifthimage-side 52 of the fifth lens element 50 are aspherical surfaces. Thefilter 70 maybe an infrared cut filter, and is disposed between theimage-side surface 52 and the image plane 71.

In the optical imaging lens element 1 of the present invention, thereare the object side 11/21/31/41/51 and image side 12/22/32/42/52 fromthe first lens element 10 to the fifth lens element 50. If a surface isaspherical, the aspheric coefficients are defined according to thefollowing formula:

${Z(Y)} = {{\frac{Y^{2}}{R}/\left( {1 + \sqrt{1 - {\left( {1 + K} \right)\frac{Y^{2}}{R^{2}}}}} \right)} + {\sum\limits_{i = 1}^{n}{a_{2i} \times Y^{2i}}}}$

In which:R represents the curvature radius of the lens element surface;Z represents the depth of an aspherical surface (the perpendiculardistance between the point of the aspherical surface at a distanceY from the optical axis and the tangent plane of the vertex on theoptical axis of the aspherical surface);Y represents a vertical distance from a point on the aspherical surfaceto the optical axis;K is a conic constant;a_(2i) is the aspheric coefficient of the 2i order.

The optical data of the first example of the optical imaging lens set 1are shown in FIG. 30 while the aspheric surface data are shown in FIG.31. In the present examples of the optical imaging lens set, thef-number of the entire optical lens element system is Fno, EFL is theeffective focal length, HFOV stands for the half field of view which ishalf of the field of view of the entire optical lens element system, andthe unit for the curvature radius, the thickness and the focal length isin millimeters (mm). Fno is 2.80. The image height is 2.52 mm. HFOV is21.114 degrees.

The length of the optical imaging lens set is effectively reduced toeffectively overcome aberration and to provide better imaging quality sothe first example is able to reduce the system length efficiently and tomaintain a sufficient optical performance.

Some important ratios of the first example are as follows:

ALT/Gmax=2.200

(G₂₃+G₄₅)/T₄=2.500

AAG/G₃₄=2.863

(G₂₃+G₃₄)/T₂=7.420

ALT/T₅=5.400

T₁/G₃₄=1.381G₂₃/(T₂+T₅)=1.601AAG/(T₃+T₅)=2.572ALT/(T₃+T₄)=3.014(T₄+T₅)/G₃₄=1.411EFL/(G₂₃+G₃₄)=3.401G₂₃/T₃=3.650(G₃₄+G₄₅)/T₂=3.462

ALT/T₁=2.602

EFL/(T₁+T₂)=5.159

Second Example

Please refer to FIG. 8 which illustrates the second example of theoptical imaging lens set 1 of the present invention. It is noted thatfrom the second example to the following examples, in order to simplifythe figures, only the components different from what the first examplehas, and the basic lens elements will be labeled in the followingfigures. Other components that are the same as what the first examplehas, such as the object-side surface, the image-side surface, the partin a vicinity of the optical axis and the part in a vicinity of itscircular periphery will be omitted in the following examples. Pleaserefer to FIG. 9A for the longitudinal spherical aberration on the imageplane 71 of the second example, please refer to FIG. 9B for theastigmatic aberration on the sagittal direction, please refer to FIG. 9Cfor the astigmatic aberration on the tangential direction, and pleaserefer to FIG. 9D for the distortion aberration. The components in thesecond example are similar to those in the first example, but theoptical data such as the curvature radius, the refractive power, thelens thickness, the lens focal length, the aspheric surface or the backfocal length in this example are different from the optical data in thefirst example, and in this example, the third object-side surface 31facing toward the object side 2 has a concave part 33′ in the vicinityof the optical axis and the third image-side surface 32 facing towardthe image side 3 has a convex part 37′ in a vicinity of its circularperiphery; the fifth object-side surface 51 facing toward the objectside 2 has a concave part 53′ in the vicinity of the optical axis andthe fifth image-side surface 52 facing toward the image side 3 has aconvex part 56′ in the vicinity of the optical axis. In particular, thesecond example is easier to be fabricated so the yield would be better.

The optical data of the second example of the optical imaging lens setare shown in FIG. 32 while the aspheric surface data are shown in FIG.33. The length from the object-side surface 11 of the first lens element10 to the image plane 71 along the optical axis 4 is 6.912 mm. The imageheight is 2.52 mm. Fno is 3.38. HFOV is 17.025 degrees.

Some important ratios of the second example are as follows:

ALT/Gmax=0.878

(G₂₃+G₄₅)/T₄=20.633

AAG/G₃₄=58.991

(G₂₃+G₃₄)/T₂=5.809

ALT/T₅=3.694

T₁/G₃₄=10.000G₂₃/(T₂+T₅)=2.413AAG/(T₃+T₅)=4.251ALT/(T₃+T₄)=4.370(T₄+T₅)/G₃₄=11.854EFL/(G₂₃+G₃₄)=2.870G₂₃/T₃=7.869(G₃₄+G₄₅)/T₂=3.119

ALT/T₁=3.341

EFL/(T₁+T₂)=6.700

Third Example

Please refer to FIG. 10 which illustrates the third example of theoptical imaging lens set 1 of the present invention. Please refer toFIG. 11A for the longitudinal spherical aberration on the image plane 71of the third example; please refer to FIG. 11B for the astigmaticaberration on the sagittal direction; please refer to FIG. 11C for theastigmatic aberration on the tangential direction, and please refer toFIG. 11D for the distortion aberration. The components in the thirdexample are similar to those in the first example, but the optical datasuch as the curvature radius, the refractive power, the lens thickness,the lens focal length, the aspheric surface or the back focal length inthis example are different from the optical data in the first example,and in this example, the third image-side surface 32 facing toward theimage side 3 has a convex part 37′ in a vicinity of its circularperiphery. In particular, 1) the TTL of the third example is shorterthan that of the first example of the present invention. 2) The thirdexample is easier to be fabricated than the first example so the yieldwould be better.

The optical data of the third example of the optical imaging lens setare shown in FIG. 34 while the aspheric surface data are shown in FIG.35. The length from the object-side surface 11 of the first lens element10 to the image plane 71 along the optical axis 4 is 6.123 mm. The imageheight is 2.52 mm. Fno is 2.80. HFOV is 20.786 degrees.

Some important ratios of the third example are as follows:

ALT/Gmax=1.712

(G₂₃+G₄₅)/T₄=4.335

AAG/G₃₄=4.665

(G₂₃+G₃₄)/T₂=5.927

ALT/T₅=4.368

T₁/G₃₄=2.313g₂₃/(T₂+T₅)=1.641AAG/(T₃+T₅)=2.321ALT/(T₃+T₄)=3.947(T₄+T₅)/G₃₄=2.200EFL/(G₂₃+G₃₄)=3.239G₂₃/T₃=5.285(G₃₄+G₄₅)/T₂=1.605

ALT/T₁=2.559

EFL/(T₁+T₂)=4.711

FOURTH EXAMPLE

Please refer to FIG. 12 which illustrates the fourth example of theoptical imaging lens set 1 of the present invention. Please refer toFIG. 13A for the longitudinal spherical aberration on the image plane 71of the fourth example; please refer to FIG. 13B for the astigmaticaberration on the sagittal direction; please refer to FIG. 13C for theastigmatic aberration on the tangential direction, and please refer toFIG. 13D for the distortion aberration. The components in the fourthexample are similar to those in the first example, but the optical datasuch as the curvature radius, the refractive power, the lens thickness,the lens focal length, the aspheric surface or the back focal length inthis example are different from the optical data in the first example,and in this example, the fourth object-side surface 41 facing toward theobject side 2 has a convex part 44′ in a vicinity of its circularperiphery; the fifth object-side surface 51 facing toward the objectside 2 has a convex part 54′ in a vicinity of its circular periphery. Inparticular, 1) the TTL of the fourth example is shorter than that of thefirst example of the present invention. 2) The fourth example is easierto be fabricated than the first example so the yield would be better.

The optical data of the second example of the optical imaging lens setare shown in FIG. 36 while the aspheric surface data are shown in FIG.37. The length from the object-side surface 11 of the first lens element10 to the image plane 71 along the optical axis 4 is 6.120 mm. The imageheight is 2.52 mm. Fno is 2.77. HFOV is 20.781 degrees.

Some important ratios of the fourth example are as follows:

ALT/Gmax=1.778

(G₂₃+G₄₅)/T₄=5.320

AAG/G₃₄=13.985

(G₂₃+G₃₄)/T₂=6.712

ALT/T₅=3.970

T₁/G₃₄=10.000G₂₃/(T₂+T₅)=1.642AAG/(T₃+T₅)=1.895ALT/(T₃+T₄)=5.033(T₄+T₅)/G₃₄=7.931EFL/(G₂₃+G₃₄)=3.725G₂₃/T₃=6.488(G₃₄+G₄₅)/T₂=0.874

ALT/T₁=2.180

EFL/(T₁+T₂)=4.124

Fifth Example

Please refer to FIG. 14 which illustrates the fifth example of theoptical imaging lens set 1 of the present invention. Please refer toFIG. 15A for the longitudinal spherical aberration on the image plane 71of the fifth example; please refer to FIG. 15B for the astigmaticaberration on the sagittal direction; please refer to FIG. 15C for theastigmatic aberration on the tangential direction, and please refer toFIG. 15D for the distortion aberration. The components in the fifthexample are similar to those in the first example, but the optical datasuch as the curvature radius, the refractive power, the lens thickness,the lens focal length, the aspheric surface or the back focal length inthis example are different from the optical data in the first example.In this example, the first image-side surface 12 facing toward the imageside 3 has a convex part 16′ in the vicinity of the optical axis and aconvex part 17′ in a vicinity of its circular periphery; the secondobject-side surface 21 facing toward the object side 2 has a concavepart 23′ in the vicinity of the optical axis and a concave part 24′ in avicinity of its circular periphery; the third object-side surface 31facing toward the object side 2 has a concave part 33′ in the vicinityof the optical axis; the fourth lens element 40 has positive refractivepower. In particular, 1) the TTL of the fifth example is shorter thanthat of the first example of the present invention. 2) The fifth exampleis easier to be fabricated than the first example so the yield would bebetter.

The optical data of the fifth example of the optical imaging lens setare shown in FIG. 38 while the aspheric surface data are shown in FIG.39. The length from the object-side surface 11 of the first lens element10 to the image plane 71 along the optical axis 4 is 5.938 mm. The imageheight is 2.52 mm. Fno is 2.77. HFOV is 20.716 degrees.

Some important ratios of the fifth example are as follows:

ALT/Gmax=2.200

(G₂₃+G₄₅)/T₄=6.561

AAG/G₃₄=12.034

(G₂₃+G₃₄)/T₂=3.502

ALT/T₅=3.824

T₁/G₃₄=4.676G₂₃/(T₂+T₅)=1.008AAG/(T₃+T₅)=2.521ALT/(T₃+T₄)=4.181(T₄+T₅)/G₃₄=5.054EFL/(G₂₃+G₃₄)=5.496G₂₃/T₃=3.690(G₃₄+G₄₅)/T₂=3.892

ALT/T₁=2.758

EFL/(T₁+T₂)=5.270

Sixth Example

Please refer to FIG. 16 which illustrates the sixth example of theoptical imaging lens set 1 of the present invention. Please refer toFIG. 17A for the longitudinal spherical aberration on the image plane 71of the sixth example; please refer to FIG. 17B for the astigmaticaberration on the sagittal direction; please refer to FIG. 17C for theastigmatic aberration on the tangential direction, and please refer toFIG. 17D for the distortion aberration. The components in the sixthexample are similar to those in the first example, but the optical datasuch as the curvature radius, the refractive power, the lens thickness,the lens focal length, the aspheric surface or the back focal length inthis example are different from the optical data in the first example,and in this example, the third image-side surface 32 facing toward theimage side 3 has a convex part 37′ in a vicinity of its circularperiphery; the fourth object-side surface 41 facing toward the objectside 2 has a concave part 43′ in the vicinity of the optical axis and aconvex part 44′ in a vicinity of its circular periphery. In particular,the sixth example is easier to be fabricated than the first example sothe yield would be better.

The optical data of the sixth example of the optical imaging lens setare shown in FIG. 40 while the aspheric surface data are shown in FIG.41. The length from the object-side surface 11 of the first lens element10 to the image plane 71 along the optical axis 4 is 6.175 mm. The imageheight is 2.52 mm. Fno is 2.79. HFOV is 20.681 degrees.

Some important ratios of the sixth example are as follows:

ALT/Gmax=1.854

(G₂₃+G₄₅)/T₄=2.953

AAG/G₃₄=3.386

(G₂₃+G₃₄)/T₂=8.766

ALT/T₅=3.488

T₁/G₃₄=1.339G₂₃/(T₂+T₅)=1.438AAG/(T₃+T₅)=1.992ALT/(T₃+T₄)=3.252(T₄+T₅)/G₃₄=2.018EFL/(G₂₃+G₃₄)=2.874G₂₃/T₃=4.646(G₃₄+G₄₅)/T₂=2.967

ALT/T₁=3.152

EFL/(T₁+T₂)=5.498

Seventh Example

Please refer to FIG. 18 which illustrates the seventh example of theoptical imaging lens set 1 of the present invention. Please refer toFIG. 19A for the longitudinal spherical aberration on the image plane 71of the seventh example; please refer to FIG. 19B for the astigmaticaberration on the sagittal direction; please refer to FIG. 19C for theastigmatic aberration on the tangential direction, and please refer toFIG. 19D for the distortion aberration. The components in the seventhexample are similar to those in the first example, but the optical datasuch as the curvature radius, the refractive power, the lens thickness,the lens focal length, the aspheric surface or the back focal length inthis example are different from the optical data in the first example.In this example, the first image-side surface 12 facing toward the imageside 3 has a convex part 16′ in the vicinity of the optical axis and aconvex part 17′ in a vicinity of its circular periphery; the secondobject-side concave surface 21 facing toward the object side 2 has aconcave part 23′ in the vicinity of the optical axis and a concave part24′ in a vicinity of its circular periphery; the third object-sidesurface 31 facing toward the object side 2 has a concave part 33′ in thevicinity of the optical axis and the third image-side surface 32 facingtoward the image side 3 has a convex part 36′ in the vicinity of theoptical axis; the fourth object-side surface 41 facing toward the objectside 2 has a concave part 43′ in the vicinity of the optical axis. Inparticular, the TTL of the seventh example is shorter than that of thefirst example of the present invention.

The optical data of the seventh example of the optical imaging lens setare shown in FIG. 42 while the aspheric surface data are shown in FIG.43. The length from the object-side surface 11 of the first lens element10 to the image plane 71 along the optical axis 4 is 5.890 mm. The imageheight is 2.52 mm. Fno is 2.81. HFOV is 20.904 degrees.

Some important ratios of the sixth example are as follows:

ALT/Gmax=1.613

(G₂₃+G₄₅)/T₄=3.484

AAG/G₃₄=5.017

(G₂₃+G₃₄)/T₂=7.099

ALT/T₅=4.244

T₁/G₃₄=1.955G₂₃/(T₂+T₅)=1.795AAG/(T₃+T₅)=2.001ALT/(T₃+T₄)=2.901(T₄+T₅)/G₃₄=2.639EFL/(G₂₃+G₃₄)=3.116G₂₃/T₃=3.829(G₃₄+G₄₅)/T₂=1.601

ALT/T₁=3.226

EFL/(T₁+T₂)=5.780

Eighth Example

Please refer to FIG. 20 which illustrates the eighth example of theoptical imaging lens set 1 of the present invention. Please refer toFIG. 21A for the longitudinal spherical aberration on the image plane 71of the eighth example; please refer to FIG. 21B for the astigmaticaberration on the sagittal direction; please refer to FIG. 21C for theastigmatic aberration on the tangential direction, and please refer toFIG. 21D for the distortion aberration. The components in the eighthexample are similar to those in the first example, but the optical datasuch as the curvature radius, the refractive power, the lens thickness,the lens focal length, the aspheric surface or the back focal length inthis example are different from the optical data in the first example,and in this example, the first image-side surface 12 facing toward theimage side 3 has a convex part 16′ in the vicinity of the optical axisand a convex part 17′ in a vicinity of its circular periphery; thesecond object-side concave surface 21 facing toward the object side 2has a concave part 23′ in the vicinity of the optical axis and a concavepart 24′ in a vicinity of its circular periphery; the third object-sidesurface 31 facing toward the object side 2 has a concave part 33′ in thevicinity of the optical axis; the fourth lens element 40 has positiverefractive power. In particular, 1) the TTL of the eighth example isshorter than that of the first example of the present invention. 2) Theeighth example is easier to be fabricated than the first example so theyield would be better.

The optical data of the eighth example of the optical imaging lens setare shown in FIG. 44 while the aspheric surface data are shown in FIG.45. The length from the object-side surface 11 of the first lens element10 to the image plane 71 along the optical axis 4 is 5.980 mm. The imageheight is 2.52 mm. Fno is 2.80. HFOV is 20.671 degrees.

Some important ratios of the eighth example are as follows:

ALT/Gmax=2.200

(G₂₃+G₄₅)/T₄=6.261

AAG/G₃₄=11.725

(G₂₃+G₃₄)/T₂=3.703

ALT/T₅=3.700

T₁/G₃₄=4.474G₂₃/(T₂+T₅)=1.000AAG/(T₃+T₅)=2.472ALT/(T₃+T₄)=4.099(T₄+T₅)/G₃₄=5.106EFL/(G₂₃+G₃₄)=5.496G₂₃/T₃=3.717(G₃₄+G₄₅)/T₂=4.128

ALT/T₁=2.806

EFL/(T₁+T₂)=5.423

Ninth Example

Please refer to FIG. 22 which illustrates the ninth example of theoptical imaging lens set 1 of the present invention. Please refer toFIG. 23A for the longitudinal spherical aberration on the image plane 71of the ninth example; please refer to FIG. 23B for the astigmaticaberration on the sagittal direction; please refer to FIG. 23C for theastigmatic aberration on the tangential direction, and please refer toFIG. 23D for the distortion aberration. The components in the ninthexample are similar to those in the first example, but the optical datasuch as the curvature radius, the refractive power, the lens thickness,the lens focal length, the aspheric surface or the back focal length inthis example are different from the optical data in the first example,and in this example, the first image-side surface 12 facing toward theimage side 3 has a convex part 16′ in the vicinity of the optical axisand a convex part 17′ in a vicinity of its circular periphery; thesecond object-side concave surface 21 facing toward the object side 2has a concave part 23′ in the vicinity of the optical axis and a concavepart 24′ in a vicinity of its circular periphery; the third object-sidesurface 31 facing toward the object side 2 has a concave part 33′ in thevicinity of the optical axis; the fourth object-side surface 41 facingtoward the object side 2 has a concave part 43′ in the vicinity of theoptical axis. In particular, the TTL of the ninth example is shorterthan that of the first example of the present invention.

The optical data of the ninth example of the optical imaging lens setare shown in FIG. 46 while the aspheric surface data are shown in FIG.47. The length from the object-side surface 11 of the first lens element10 to the image plane 71 along the optical axis 4 is 5.940 mm. The imageheight is 2.52 mm. Fno is 2.81. HFOV is 20.704 degrees.

Some important ratios of the ninth example are as follows:

ALT/Gmax=2.145

(G₂₃+G₄₅)/T₄=2.513

AAG/G₃₄=1.897

(G₂₃+G₃₄)/T₂=9.271

ALT/T₅=4.029

T₁/G₃₄=0.758G₂₃/(T₂+T₅)=1.060AAG/(T₃+T₅)=2.262ALT/(T₃+T₄)=3.233(T₄+T₅)/G₃₄=0.889EFL/(G₂₃+G₃₄)=3.095G₂₃/T₃=2.500(G₃₄+G₄₅)/T₂=5.936

ALT/T₁=2.828

EFL/(T₁+T₂)=5.761

Tenth Example

Please refer to FIG. 24 which illustrates the tenth example of theoptical imaging lens set 1 of the present invention. Please refer toFIG. 25A for the longitudinal spherical aberration on the image plane 71of the tenth example; please refer to FIG. 25B for the astigmaticaberration on the sagittal direction; please refer to FIG. 25C for theastigmatic aberration on the tangential direction, and please refer toFIG. 25D for the distortion aberration. The components in the tenthexample are similar to those in the first example, but the optical datasuch as the curvature radius, the refractive power, the lens thickness,the lens focal length, the aspheric surface or the back focal length inthis example are different from the optical data in the first example,and in this example, the third object-side surface 31 facing toward theobject side 2 has a concave part 33′ in the vicinity of the optical axisand the third image-side surface 32 facing toward the image side 3 has aconvex part 36′ in the vicinity of the optical axis; the fourthobject-side surface 1 facing toward the object side 2 has a part concave43′ in the vicinity of the optical axis and the fourth image-sidesurface 42 facing toward the image side 3 has a convex part 46′ in thevicinity of the optical axis; the fifth lens element 50 has negativerefractive power and the fifth object-side surface 51 facing toward theobject side 2 has a concave part 53′ in the vicinity of the opticalaxis. In particular, 1) the TTL of the tenth example is shorter thanthat of the first example of the present invention. 2) The tenth exampleis easier to be fabricated than the first example so the yield would bebetter.

The optical data of the tenth example of the optical imaging lens setare shown in FIG. 48 while the aspheric surface data are shown in FIG.49. The length from the object-side surface 11 of the first lens element10 to the image plane 71 along the optical axis 4 is 5.897 mm. The imageheight is 2.52 mm. Fno is 2.81. HFOV is 20.873 degrees.

Some important ratios of the tenth example are as follows:

ALT/Gmax=1.388

(G₂₃+G₄₅)/T₄=3.617

AAG/G₃₄=5.401

(G₂₃+G₃₄)/T₂=6.921

ALT/T₅=3.594

T₁/G₃₄=1.420G₂₃/(T₂+T₅)=1.767AAG/(T₃+T₅)=2.342ALT/(T₃+T₄)=2.922(T₄+T₅)/G₃₄=2.796EFL/(G₂₃+G₃₄)=2.717G₂₃/T₃=5.633(G₃₄+G₄₅)/T₂=1.780

ALT/T₁=4.000

EFL/(T₁+T₂)=6.419

Eleventh Example

Please refer to FIG. 26 which illustrates the eleventh example of theoptical imaging lens set 1 of the present invention. Please refer toFIG. 27A for the longitudinal spherical aberration on the image plane 71of the eleventh example; please refer to FIG. 27B for the astigmaticaberration on the sagittal direction; please refer to FIG. 27C for theastigmatic aberration on the tangential direction, and please refer toFIG. 27D for the distortion aberration. The components in the eleventhexample are similar to those in the first example, but the optical datasuch as the curvature radius, the refractive power, the lens thickness,the lens focal length, the aspheric surface or the back focal length inthis example are different from the optical data in the first example,and in this example, the third object-side surface 31 facing toward theobject side 2 has a concave part 33′ in the vicinity of the optical axisand the third image-side surface 32 facing toward the image side 3 has aconvex part 36′ in the vicinity of the optical axis; the fourthobject-side surface 41 facing toward the object side 2 has a partconcave 43′ in the vicinity of the optical axis. In particular, 1) theTTL of the eleventh example is shorter than that of the first example ofthe present invention. 2) The eleventh example is easier to befabricated than the first example so the yield would be better.

The optical data of the eleventh example of the optical imaging lens setare shown in FIG. 50 while the aspheric surface data are shown in FIG.51. The length from the object-side surface 11 of the first lens element10 to the image plane 71 along the optical axis 4 is 5.940 mm. The imageheight is 2.52 mm. Fno is 2.81. HFOV is 20.798 degrees.

Some important ratios of the eleventh example are as follows: s

ALT/Gmax=1.318

(G₂₃+G₄₅)/T₄=4.785

AAG/G₃₄=6.536

(G₂₃+G₃₄)/T₂=10.806

ALT/T₅=3.818

T₁/G₃₄=2.100G₂₃/(T₂+T₅)=2.194AAG/(T₃+T₅)=2.208ALT/(T₃+T₄)=2.900(T₄+T₅)/G₃₄=2.934EFL/(G₂₃+G₃₄)=2.891G₂₃/T₃=4.351(G₃₄+G₄₅)/T₂=2.440

ALT/T₁=3.232

EFL/(T₁+T₂)=6.659

Some important ratios in each example are shown in FIG. 52. The distancebetween the fifth image-side surface 52 of the fifth lens element 50 tothe filter 70 along the optical axis 4 is G5F; the thickness of thefilter 70 along the optical axis 4 is TF; the distance between thefilter 70 to the image plane 71 along the optical axis 4 is GFP; thedistance between the fifth image-side surface 52 of the fifth lenselement 50 to the image plane 71 along the optical axis 4 is BFL.Therefore, BFL=G5F+TF+GFP.

In the light of the above examples, the inventors observe the followingfeatures:

1) The location of the aperture stop has to go with conditionalparameters such as the curvatures of each lens element, the thickness ofeach lens element and the air gaps between adjacent lens elements tomaintain good imaging quality. The first lens element of the presentinvention has a first object-side surface facing toward the object sideand the first object-side surface a convex part in the vicinity of theoptical axis to go with the aperture stop at the object-side of thefirst lens element to effectively concentrate the light and to decreasethe length of the optical imaging lens set.2) The second lens element 20 has a second image-side surface facingtoward the image side and the second image-side surface has a concavepart 27 in a vicinity of its circular periphery to go with the thirdobject-side surface 31 facing toward the object side 2 and having aconcave part 34 in a vicinity of its circular periphery to correct theangle of light and to reduce aberration.3. The present invention in particular arrange the first lens element 10glued to the second lens element 20 to effective increase the criticalangle of the total reflection to decrease light to scatter.

In addition, it is found that there are some better ratio ranges fordifferent optical data according to the above various important ratios.Better ratio ranges help the designers to design the better opticalperformance, effectively reduced length, good quality of zoom-outimages, wide viewing angle, smaller f-number, and a technically possibleoptical imaging lens set. A good ratio helps to control the lensthickness or the air gaps to maintain a suitable range and keeps a lenselement from being too thick to facilitate the reduction of the overallsize or too thin to assemble the optical imaging lens set. For example:

1. ALT/G_(max)≤2.2, a preferable range may be 0.8˜2.2;

2. (G₂₃+G₄₅)/T₄≥2.5, a preferable range may be 2.5˜20.7;

3. AAG/G₃₄≤60, a preferable range may be 1.8˜60;

4. (G₂₃+G₃₄)/T₂≤3.5, a preferable range may be 3.5˜10.9;

5. ALT/T₅≤5.4, a preferable range may be 3.4˜5.4;

6. T₁/G₃₄≤10.0, a preferable range may be 0.7˜10.0;

7. G₂₃/(T₂+T₅)≥1.0, a preferable range may be 1.0˜2.5;

8. AAG/(T₃+T₅)≥1.8, a preferable range may be 1.8˜4.3;

9. ALT/(T₃+T₄)≥2.9, a preferable range may be 2.9˜5.1;

10. (T₄+T₅)/G₃₄≤30.0, a preferable range may be 0.8˜30.0;

11. EFL/(G₂₃+G₃₄)≤5.5, a preferable range may be 2.7˜5.5;

12. G₂₃/T₃≥2.5, a preferable range may be 2.5˜7.9;

13. (G₃₄+G₄₅)/T₂≥0.8, a preferable range may be 0.8˜6.0;

14. ALT/T₁≤4.0, a preferable range may be 2.1˜4.0;

15. EFL/(T₁+T₂)≤6.7, a preferable range may be 4.1˜6.7.

In the light of the unpredictability of the optical imaging lens set,the present invention suggests the above principles. The accordance ofthe principles preferably helps decrease the TTL, increase the aperturestop available, increase the HFOV, increase the imaging quality andincrease the yield of the assembling to overcome the drawbacks of priorart. The above limitations may be properly combined at the discretion ofpersons who practice the present invention and they are not limited asshown above. To note that, in addition to the above curvatures orratios, the curvatures in the examples may go with the refractive powerto enhance the system performance and/or resolution and to increase theyield. For example, the positive refractive power of the first lenselement 10 goes with the negative refractive power of the second lenselement 20 to effectively concentrate the light.

The optical imaging lens set 1 of the present invention may be appliedto a portable electronic device. Please refer to FIG. 28. FIG. 28illustrates a first preferred example of the optical imaging lens set 1of the present invention for use in a portable electronic device 100.The portable electronic device 100 includes a case 110, and an imagemodule 120 mounted in the case 110. A mobile phone is illustrated inFIG. 28 as an example, but the portable electronic device 100 is notlimited to a mobile phone.

As shown in FIG. 28, the image module 120 includes the optical imaginglens set 1 as described above. FIG. 28 illustrates the aforementionedfirst example of the optical imaging lens set 1. In addition, theportable electronic device 100 also contains a barrel 130 for theinstallation of the optical imaging lens set 1, a module housing unit140 for the installation of the barrel 130, a substrate 172 for theinstallation of the module housing unit 140 and an image sensor 70disposed at the substrate 172, and at the image side 3 of the opticalimaging lens set 1. The image sensor 70 in the optical imaging lens set1 may be an electronic photosensitive element, such as a charge coupleddevice or a complementary metal oxide semiconductor element. The imageplane 71 forms at the image sensor 70.

The image sensor 70 used here is a product of chip on board (COB)package rather than a product of the conventional chip scale package(CSP) so it is directly attached to the substrate 172, and protectiveglass is not needed in front of the image sensor 70 in the opticalimaging lens set 1, but the present invention is not limited to this.

To be noticed in particular, the optional filter 70 may be omitted inother examples although the optional filter 70 is present in thisexample. The case 110, the barrel 130, and/or the module housing unit140 may be a single element or consist of a plurality of elements, butthe present invention is not limited to this.

Each one of the five lens elements 10, 20, 30, 40 and 50 with refractivepower is installed in the barrel 130 with air gaps disposed between twoadjacent lens elements in an exemplary way. The module housing unit 140has a lens element housing 141, and an image sensor housing 146installed between the lens element housing 141 and the image sensor 70.However in other examples, the image sensor housing 146 is optional. Thebarrel 130 is installed coaxially along with the lens element housing141 along the axis I-I′, and the barrel 130 is provided inside of thelens element housing 141.

Please also refer to FIG. 29 for another application of theaforementioned optical imaging lens set 1 in a portable electronicdevice 200 in the second preferred example. The main differences betweenthe portable electronic device 200 in the second preferred example andthe portable electronic device 100 in the first preferred example are:the lens element housing 141 has a first seat element 142, a second seatelement 143, a coil 144 and a magnetic component 145. The first seatelement 142 is for the installation of the barrel 130, exteriorlyattached to the barrel 130 and disposed along the axis I-I′. The secondseat element 143 is disposed along the axis I-I′ and surrounds theexterior of the first seat element 142. The coil 144 is provided betweenthe outside of the first seat element 142 and the inside of the secondseat element 143. The magnetic component 145 is disposed between theoutside of the coil 144 and the inside of the second seat element 143.

The first seat element 142 may pull the barrel 130 and the opticalimaging lens set 1 which is disposed inside of the barrel 130 to movealong the axis I-I′, namely the optical axis 4 in FIG. 1. The imagesensor housing 146 is attached to the second seat element 143. Thefilter 70, such as an infrared filter, is installed at the image sensorhousing 146. Other details of the portable electronic device 200 in thesecond preferred example are similar to those of the portable electronicdevice 100 in the first preferred example so they are not elaboratedagain.

Those skilled in the art will readily observe that numerousmodifications and alterations of the device and method may be made whileretaining the teachings of the invention. Accordingly, the abovedisclosure should be construed as limited only by the metes and boundsof the appended claims.

What is claimed is:
 1. An optical imaging lens set, from an object sidetoward an image side in order along an optical axis comprising: a firstlens element, a second lens element, a third lens element, a fourth lenselement and a fifth lens element, the first lens element to the fifthlens element each having an object-side surface facing toward the objectside as well as an image-side surface facing toward the image side,wherein: the first lens element has positive refractive power and thefirst lens element is glued to the second lens element without an airgap; the third lens element has negative refractive power and theobject-side surface of the third lens element has a concave portion in avicinity of a periphery of the third lens element; and the fifth lenselement has positive refractive power; wherein, lens elements havingrefractive power included by the optical imaging lens set are only fivelens elements described above.
 2. The optical imaging lens set of claim1, satisfying 0.916≤(G₃₄+G₄₅)/T₃≤4.977, wherein an air gap G₃₄ isbetween the third lens element and the fourth lens element along theoptical axis, an air gap G₄₅ is between the fourth lens element and thefifth lens element along the optical axis and the third lens element hasa third lens element thickness T₃ along the optical axis.
 3. The opticalimaging lens set of claim 1, satisfying
 0. 983≤AAG/(T₂+G₂₃)≤1.982,wherein AAG is a sum of all air gaps between each lens elements from thefirst lens element to the fifth lens element along the optical axis, thesecond lens element has a second lens element thickness T₂ along theoptical axis and an air gap G₂₃ is between the second lens element andthe third lens element along the optical axis.
 4. The optical imaginglens set of claim 1, satisfying 1.820≤(T₁+T₂+T₃)/T₅≤3.278, wherein thefirst lens element has a first lens element thickness T₁ along theoptical axis, the second lens element has a second lens elementthickness T₂ along the optical axis, the third lens element has a thirdlens element thickness T₃ along the optical axis and the fifth lenselement has a fifth lens element thickness T₅ along the optical axis. 5.The optical imaging lens set of claim 1, satisfying1.183≤(G₂₃+G₄₅)/T₁<5.796, wherein an air gap G₂₃ is between the secondlens element and the third lens element along the optical axis, an airgap G₄₅ is between the fourth lens element and the fifth lens elementalong the optical axis and the first lens element has a first lenselement thickness T₁ along the optical axis.
 6. The optical imaging lensset of claim 1, satisfying 1.865≤ALT/BFL≤8.859, wherein ALT is a totalthicknesses of all five lens elements along the optical axis and BFL isa distance between the image-side surface of the fifth lens element andan image plane along the optical axis.
 7. The optical imaging lens setof claim 1, satisfying 1.932≤EFL/(G₂₃+G₄₅)≤6.093, wherein EFL is aneffective focal length of the optical imaging lens set, an air gap G₂₃is between the second lens element and the third lens element along theoptical axis and an air gap G₄₅ is between the fourth lens element andthe fifth lens element along the optical axis.
 8. The optical imaginglens set of claim 1, satisfying 4.399≤TTL/(T₄+T₅)≤8.112, wherein TTL isa distance from the object-side surface of the first lens element to animage plane along the optical axis, the fourth lens element has a fourthlens element thickness T₄ along the optical axis and the fifth lenselement has a fifth lens element thickness T₅ along the optical axis. 9.The optical imaging lens set of claim 1, satisfying2.794≤(G₂₃+T₃)/T₄≤15.252, wherein the third lens element has a thirdlens element thickness T₃ along the optical axis, the fourth lenselement has a fourth lens element thickness T₄ along the optical axisand an air gap G₂₃ is between the second lens element and the third lenselement along the optical axis.
 10. The optical imaging lens set ofclaim 1, satisfying 1.899≤EFL/AAG≤3.530, wherein EFL is an effectivefocal length of the optical imaging lens set and AAG is a sum of all airgaps between each lens elements from the first lens element to the fifthlens element along the optical axis.
 11. The optical imaging lens set ofclaim 1, satisfying 1.261≤(T₂+G₂₃)/T₁≤4.474, wherein the first lenselement has a first lens element thickness T₁ along the optical axis,the second lens element has a second lens element thickness T₂ along theoptical axis and an air gap G₂₃ is between the second lens element andthe third lens element along the optical axis.
 12. The optical imaginglens set of claim 1, satisfying 4.154≤EFL/(T₁+T₃)≤7.552, wherein EFL isan effective focal length of the optical imaging lens set, the firstlens element has a first lens element thickness T₁ along the opticalaxis and the third lens element has a third lens element thickness T₃along the optical axis.
 13. The optical imaging lens set of claim 1,satisfying 2.547≤AAG/T₅≤6.523, wherein AAG is a sum of all air gapsbetween each lens elements from the first lens element to the fifth lenselement along the optical axis and the fifth lens element has a fifthlens element thickness T₅ along the optical axis.
 14. The opticalimaging lens set of claim 1, satisfying 0.439≤(T₃+T₄+T₅)/G₂₃≤1.561,wherein the third lens element has a third lens element thickness T₃along the optical axis, the fourth lens element has a fourth lenselement thickness T₄ along the optical axis, the fifth lens element hasa fifth lens element thickness T₅ along the optical axis and an air gapG₂₃ is between the second lens element and the third lens element alongthe optical axis.
 15. The optical imaging lens set of claim 1,satisfying 0.417≤BFL/T₅≤2.893, wherein BFL is a distance between theimage-side surface of the fifth lens element and an image plane alongthe optical axis and the fifth lens element has a fifth lens elementthickness T₅ along the optical axis.
 16. The optical imaging lens set ofclaim 1, satisfying 1.010≤G₂₃/T₁≤3.802, wherein the first lens elementhas a first lens element thickness T₁ along the optical axis and an airgap G₂₃ is between the second lens element and the third lens elementalong the optical axis.
 17. The optical imaging lens set of claim 1,satisfying 0.747≤ALT/(T₂+G₂₃)≤2.241, wherein ALT is a total thicknessesof all five lens elements along the optical axis, the second lenselement has a second lens element thickness T₂ along the optical axisand an air gap G₂₃ is between the second lens element and the third lenselement along the optical axis.
 18. The optical imaging lens set ofclaim 1, satisfying 2.945≤EFL/G_(max)≤5.794, wherein EFL is an effectivefocal length of the optical imaging lens set and G_(max) is a max valueof air gaps from the first lens element to the fifth lens element alongthe optical axis.
 19. The optical imaging lens set of claim 1,satisfying 1.990≤(T₁+G₃₄)/T₄≤4.925, wherein the first lens element has afirst lens element thickness T₁ along the optical axis, the fourth lenselement has a fourth lens element thickness T₄ along the optical axisand an air gap G₃₄ is between the third lens element and the fourth lenselement along the optical axis.
 20. The optical imaging lens set ofclaim 1, satisfying
 2. 330≤TTL/(G₂₃+T₄)≤4.481, wherein TTL is a distancefrom the object-side surface of the first lens element to an image planealong the optical axis, an air gap G₂₃ is between the second lenselement and the third lens element along the optical axis and the fourthlens element has a fourth lens element thickness T₄ along the opticalaxis.